Search engines consider www.somedomain.com and somedomain.com to be two
different URLs when they both go to the same location. This SEO enhancement
prevents penalty for duplicate content by redirecting all incoming links to
one or the other.

Will also attempt to find the correct link when a user enters a URL that does
not exist based on exact WordPress query. Will instead try to parse the URL
or query in an attempt to figure the correct page to go to.